Method of manufacturing tube apparatus.



PATENTED DEC. 17, 1907 0. ZIMMERMANN. METHOD OF MANUFACTURING TUBE APPARATUS.

2 SHEETS-SHEKT 1.

Ira 221% la 7 APPLICATION FILED 3111.2. 1.906.

I Fig.1

Will/z 66865. Kfinlft PATENTED DEG.17; 1907.

0. ZIMMERMANN. METHOD OF MANUFACTURING TUBE APPARATUS.

APPLIOATION FILED JAN. 2, 1906.

2 SHEETS-SHEET 2 152 2/0 izfor subset of the King of Bavaria, resi UNITED STATES PATENT oFFICE.

OTTO zIMirERMANN, OF LUDW IGSHAFlfiN-ON-THE-RHINE, GERMANY.

METHOD OF MANUFAGIURING-TUBE APPARATUS.

To all whom it may concern: Be it known that I, O'r'ro ZIMMEBMANN, a

at' Lu wigshafen-on-the-Rhine, German mpxilrle, have invented certain new and useful rovements in Methods of Manufacturing Tu e Apparatus, of which the following is a full, clear, and exact specification.

My invention relates to the manufacture of tube apparatus and has for its object the method of making such apparatus whereby I am enabled to assemble any desired number of tubes in aflue sheet closer together than by any other method known to me.

To assemble tubes and thelike with their mantles or coverings as closely together as Ipossible is a problem that has long been nown in this art and so far as I am aware, never before been accomplished. Itis impossible to secure tubes close together in their flue sheets by individually inserting the tubes;

Referring to the drawings in which like parts are similarly designated, Fi e 1, is a vertical sectional view of a set '0 tubes set close together and provided with a flue sheet at one end. Fig. 2 is a horizontal section of Fig. 1. Fig. 3, is a transverse section showing a tube set having a corrugated mantle and a c lindrical mantle outside the same. Fig. 4, s ows in section, tubes arranged concentrically and their flue sheet. Fig. 5, is a section showing the assembled tubes .and casing in the mold ready for having the flue sheet cast thereon.

The assembled set of tubes 0 with their surroundin casing are placed in a mold to and the mo d being eated during the operation and while the molten metal is being poured through one of the necessary side openings y in the casing. The opening is afterwards fitted with a pipe joint for the circulatin medium, either steam or water.-

When t e tubes are very close together I use an open, flat, heated mold as 'w of suitable depth in which the metal, to form the flue sheet, maybe melted.

When the metalin the mold has melted the tubes, or when one or more mantles or casings are to surroundthe tubes, the ends Specification of Letters Patent. Application filed January 2. 1906. Serial No. 294.306.

he.- i lg gated flue. sheets could'not heretofore be so Patentod D ec. 17, 1007.

ends from adhering to. the metal in the mold they are coated with graphite or clay, but

are left open so that the metal will rise in them andheat the ends of the tubes. This is important where the tubesare laced very close together in order to insure t e metal of the flue sheet adhering tightly to the ends of the tube.

Instead of coating the interior of the tubes I insert therein, short sleeves or bushings of iron or steel to prevent the molten metal in the mold from adhering to the interior of the tubes. plug of metal that has entere them can readily be knocked out and after melting out These sleeves or bushin s with-thethe metal plugs are used again, while the melted metal plugs are returned tothe mold. I am enabled by this method to make flue sheets of very large diameter, because the molten metal used only rises or travels along the tubes a distance equal to the thickness of the flue sheets, 'i. 0. during the insertion of the ends of the tubes into the mold. When casting the metal around the ends of the tubes by pouring it into the mold the metal bethe equalizing of any possible existing or arising pressures and at the same time give a very much larger heat exchanging surface, thereby increasing the capacity of the apparatus.

ot the casings to the corrure'adily done. The edges of the sheet had to. be molded to a shape corresponding to method.

I amen'abled to assemble one or more casings about the tube set and simultaneously secure them with the tubes to the flue sheet.

In 3, I have shown an inner corrugated i within the corrugated casing p. Such arrangements are especially applicable to automobile coolers or radiators where the greatest possible cooling surface, occupying the sma lest possible 5 ace is very desirable.

In order to ren er the entrance of air to the tubes more easy, the ends of the tubes are made trumpet shaped as shown by dotted lines in'Fig. 1.

Instead of corrugated casings, smooth casings may be used and any desired number of tubes may be assembled concentrically as shown in Fig. 4.

Openings g may be formed in the flue sheet during the casting by placing cores in the mold in order to provide entrances and exits for the circulating medium into and outof the radiator.

I claim,

1. The method of forming tube apparatus.

which comprises roviding a suita e mold inwhich the flue s eet metal is contained in a molten state, assembling the tubes in their proper relation to one another, protecting the inner surface of the tube ends from adhering to the flue sheet metal and then setting the tubes in molten metal and mold,

allowing the flue sheet metal to enter the ends of the tubes and thereby heating the tube ends from the inside as well as the outside and allowing the molten metal to harden about the tube ends.

2. The method of forming tube apparatus which comprises providing a heated mold metal bushings with their containing containing a suitable molten flue sheet metal, and setting the assembled tubes having the interior of their ends provided with temporary metal bushings, into the molten metal, thereby heating the tube ends both exteriorly and interiorly, allowing the molten metal to harden, removing the tubes and flue sheet from the mold and forcing out the plug of flue sheet metal.

3. The method of forming tube apparatus which consists in assembling the tubes of a set with their casing in proper relation to one another, coating their end surfaces to which the flue sheet is to adhere with a soldering Water and. providing the interior of the tube ends with a bushing and the surfaces of the ends of the casing that are not to-be connected to the flue sheet with a substance preventing the adhesion of metal, providin a mold containing the fluid metal for the ue sheet, setting the ends of the tubes and casing therein and allowing the molten metal to cool and finally knockin out the bushings with the metal that has hardened in them, substantially as described.

In witness whereof, I have hereunto signed my name in the presence of two subscribing witnesses.

OTTO ZIMMERMANN.

Witnesses: V)

CARL ADOLPH HOBISREITING, VALENTIN MiiLLER. 

